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2. 发明授权

US4307061A Self-recovering soot detector, particularly to monitor carbon content in diesel engine exhaust gases 失效
标题翻译：自回收烟灰探测器，特别是监测柴油机废气中的碳含量
公开(公告)号：US4307061A
公开(公告)日：1981-12-22
申请号：US062361
申请日：1979-07-31
申请人： Walter Sarholz
发明人： Walter Sarholz
IPC分类号： G01N27/00 , F02B1/04 , F02B3/06 , G01N27/04 , H01C1/00 , H01T13/14
CPC分类号： G01N27/04 , F02B1/04 , F02B3/06
摘要： An insulating support body, for example an aluminum oxide ceramic, supports two electrodes spaced from each other by a small gap, for example 0.1 mm, which will have therebetween a high resistance. Upon collection of soot, the resistance between the electrodes across the gap will drop, which can be indicated by sensing current through the electrodes upon connection to a source of electrical energy. To remove soot upon termination of smoking, or soot contents in the gases, the electrodes are applied over, or embedded in a layer of essentially non-conducting catalyzing material which, in the presence of oxygen, catalyzes the oxidation of soot located in the gap between the electrodes to thereby remove the soot by oxidation and restore the resistance of the path between the electrodes and hence the sensitivity of the sensor for subsequent detection of accumulation of soot in the gap. Preferably, the non-conductive catalyzing material is a mixture of platinum, or a platinum metal, or a platinum metal alloy and a metal oxide which is compatible with, or identical to the ceramic base, for example aluminum oxide. The essentially electrically non-conductive layer can be applied by thick-film technology, and the electrodes also by thick-film technology thereover, or the electrodes may be in the form of fine platinum wires extending through the catalyzing electrically non-conductive layer. The sensing element can be held in a housing or socket, similar to a spark plug socket.
摘要翻译：绝缘支撑体，例如氧化铝陶瓷，通过间隙较小的间隙支撑两个电极，例如0.1mm，这两个电极之间将具有高电阻。在收集烟灰时，穿过间隙的电极之间的电阻将下降，这可以通过在连接到电能源时感测通过电极的电流来指示。为了在吸烟结束时除去烟灰或气体中的烟灰含量，将电极施加在基本上不导电的催化材料层上或嵌入基本上不导电的催化材料层中，该层在氧的存在下催化位于间隙中的烟灰的氧化在电极之间，从而通过氧化除去烟灰并恢复电极之间的路径的电阻，并因此恢复传感器的灵敏度，以便随后检测到间隙中的烟灰积聚。优选地，非导电催化材料是与陶瓷基体例如氧化铝相容或相同的铂或铂金属或铂金属合金和金属氧化物的混合物。基本上不导电的层可以通过厚膜技术施加，并且电极也通过其上的厚膜技术施加，或者电极可以是延伸穿过催化非导电层的细铂丝的形式。感测元件可以保持在壳体或插座中，类似于火花塞插座。

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